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First and foremost, thank you for detailed and thorough instructionUsing the very first code example my motor would only turn in one direction, and after long wait, repeat.It turns out the problem was in the second part of code where the motor is supposed to change direction. Particularly, these two lines:digitalWrite(R_EN,LOW); digitalWrite(L_EN,LOW);render motor off. When changed to digitalWrite(R_EN,HIGH); digitalWrite(L_EN,HIGH);everything worked nicely, just like in the video.I guess, these lines might be useful between cycles when the motor might need to be turned off intentionally.Again, many thanks, hope my observation might be of use for the next maker.Cheers,O.K.